This is a plot of the data only from year 2013 by type of vehicle.

This is using data from the city of Cambridge, MA. List of crashes involving motor vehicles, bicycles and/or pedestrians reported in the City of Cambridge from January 2010 through June 2016 More data can be found on https://data.cambridgema.gov/Public-Safety/Police-Department-Crash-Data-Historical/ybny-g9cv.